Acoustid fingerprinter is a cross-platform GUI application that uses Chromaprint to submit audio fingerprints from your music collection to the Acoustid database. Only tagged audio files are submitted. Files tagged by MusicBrainz applications such as Picard or Jaikoz are preferred, but it will submit fingerprints for any files that have tags such as track title, artist name, album name, etc.
Latest release — 0.5.1 (Jan 8, 2012)
source code here https://github.com/downloads/lalinsky/acoustid-fingerprinter/acoustid-fingerprinter-0.5.1.tar.gz
ready ebuild already in "pro-audio" overlay.
Seems like the project is dead and Qt4-only, thus OBSOLETE.